<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01 - 加载百度离线地图</title>
    <script src="../lib/ol4/ol4.js"></script>
    <script src="../lib/bd09.js"></script>
    <link rel="stylesheet" href="../css/ol4/ol.css">
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        html, body {
            width: 100%;
            height: 100%;
        }

        #map {
            width: auto;
            height: 100%;
        }
    </style>
</head>
<body>
<div id="map"></div>
</body>
<script>
    const projectionBD09 = new ol.proj.Projection({
        code: 'BD:09',
        extent: [-20037726.37, -11708041.66, 20037726.37, 12474104.17],
        units: 'm',
        axisOrientation: 'neu',
        global: false
    });
    ol.proj.addProjection(projectionBD09);
    ol.proj.addCoordinateTransforms('EPSG:4326', 'BD:09', coordinate => {
        return lngLatToMercator(coordinate);
    }, (coordinate => {
        return mercatorToLngLat(coordinate);
    }));
    console.log(ol.proj.get('BD:09'));

    const projectionExtentInBD09 = projectionBD09.getExtent();
    console.log(projectionExtentInBD09);
    const resolutions = [];
    const maxZoom = 18;
    const minZoom = 0;
    // 计算百度使用的分辨率
    for (let i = minZoom; i <= maxZoom; i++) {
        resolutions[i] = Math.pow(2, maxZoom - i);
    }
    console.log(resolutions);

    const tileGrid = new ol.tilegrid.TileGrid({
        origin: [0, 0],
        resolutions: resolutions,
        extent: projectionExtentInBD09
    });

    const baiduSource = new ol.source.TileImage({
        projection: 'BD:09',
        tileGrid: tileGrid,
        tileUrlFunction: (tileCoord) => {
            let [z, x, y] = tileCoord;
            // y = -y - 1;
            // 百度瓦片服务url将负数使用M前缀来标识
            // return `http://192.168.130.38:8080/baidumaps/roadmap/${z}/${x}/${y}.png`;
            return `http://192.168.106.167:8080/scgis/roadmap?level=${z}&col=${x}&row=${y}`;
            // return `https://60.6.222.101:10001/scgis/roadmap?level=${z}&col=${x}&row=${y}`;
            // return `http://192.168.106.167:8080/scgis/satelite?level=${z}&col=${x}&row=${y}`;
            // return `http://192.168.106.167:8080/scgis/satelite?level=${z}&col=${x}&row=${y}`;
        },
        wrapX: false
    });
    // 百度地图层
    const baiduMapLayer = new ol.layer.Tile({
        source: baiduSource
    });

    const centerPoint = [116.384722, 39.889916]; // 邢台 - [114.507435,37.074612] ; 北京 - [116.384722, 39.889916]

    const centerPointBD09 = ol.proj.transform(centerPoint, 'EPSG:4326', 'BD:09');

    // console.log(centerPointBD09);

    const view = new ol.View({
        center: centerPointBD09,
        projection: 'BD:09',
        zoom: 3,
        maxZoom: 18,
        minZoom: 3,
        resolutions
    });

    const map = new ol.Map({
        layers: [
            baiduMapLayer
        ],
        target: 'map',
        view
    });

    // const newCenterPoint = ol.proj.transform([114.507435,37.074612], 'EPSG:4326', 'BD:09');
    const newCenterPoint = ol.proj.transform([114.507435,37.074612], 'EPSG:4326', 'BD:09');

    view.setCenter(newCenterPoint);
    view.setZoom(8);
</script>
</html>